Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0d386f644d450a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-24 21:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be690319e2d41ec70e04f84c3d5640d7 SHA-1: 920123216e9ed3148e4ddc4d546bcfc42979452c SHA-256: ab0d386f644d450a43ba5ad9db6970f94e757996a34be4a727900dc930c24476
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=physical+sciences+siyavula+textbook
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/lukosumekutid-dezejubavibi-sobej-zulavun.pdf
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/9145390.pdf
    • http://sifinujox.sportsontheweb.net/data_structures_and_algorithms_in_java_goodrich.pdf
    • http://duwudivusupo.mygamesonline.org/32930036334.pdf
    • http://paxabak.mypressonline.com/how_many_chapters_in_the_new_testament.pdf
    • http://novijixonusasu.mywebcommunity.org/47880205475.pdf
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/4c89948de0c.pdf
    • http://nunopasatipimav.medianewsonline.com/28359461072.pdf
    • http://wejuveziwep.mypressonline.com/brillouin_zone.pdf
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/c3c86a8a1fe91.pdf
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/9ed7669ae334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9799ccd1-1c9f-42ae-b71a-617a0be7c691/what_does_the_phrase_the_medium_is_the_message_mean.pdf
    • https://uploads.strikinglycdn.com/files/3f0d1542-c3da-43ca-bd83-27ddabde0d52/can_parents_see_dojo_points.pdf
    • https://s3.amazonaws.com/bagisi/kazafufemuvi.pdf
    • https://s3.amazonaws.com/davubewu/netasekolokesirapupekuta.pdf
    • https://s3.amazonaws.com/xidazeze/rpsc_ldc_answer_key_2018.pdf
    • https://s3.amazonaws.com/gozifep/dediti.pdf
    • https://uploads.strikinglycdn.com/files/7d8b936b-8123-4acb-b718-88ca0776ea83/zmodo_dvr_camera_system.pdf
    • https://uploads.strikinglycdn.com/files/f8355f98-ff66-45e5-aa47-455856b78c50/zebogamaz.pdf
    • https://s3.amazonaws.com/tawosutosuxi/33909952926.pdf
    • https://s3.amazonaws.com/ragejufa/let_it_go_violin_sheet_music_musescore.pdf
    • https://s3.amazonaws.com/limepusotanal/kimono_sash_crossword_answer.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/wanejofavowekavudafus.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/zasetov.pdf
    • https://s3.amazonaws.com/remuv/jowekexefopagifigarezi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42b.bin
cabaf10fb8cbe9a19f498cf5229193785bdf14fb6aff8d43144091e3798223b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5228 bytes
font_01_sfnt_off0000f603.bin
bb873a966c88e8096f319abb8eaaccf4aca31ecf9e88bd3a1738026316312a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10708 bytes

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